The situation
Yemen’s internationally recognised government says its forces are regrouping after Houthi forces captured Mokha on September 10 and Mayun Island on September 11. The gains extend Houthi positions onto Yemen’s Red Sea coast and into the Bab el-Mandeb Strait area, but control of the newly seized locations remains contested.
On September 13, the Houthis claimed further missile and drone attacks against Saudi Arabia. Saudi civil defence reported that a projectile landed near the Yemeni border and injured two people; a separate claimed strike in Najran was not independently substantiated. Separately, Saudi Arabia precautionarily shut the East-West pipeline after a September 10 drone attack. Iraq has said the drones were launched from Maysan province and has opened an investigation, but the shutdown should not be treated as proof that the pipeline remains offline.
Why it matters
Mayun and Mokha give the Houthis a more direct territorial position near the narrow waterway linking the Red Sea and Gulf of Aden. This increases operational risk for shipping in a corridor that is also relevant to Saudi oil exports when transit through the Strait of Hormuz is disrupted, without establishing a general closure of Bab el-Mandeb.
The pipeline attack underscores the pressure on Saudi Arabia’s alternative export logistics. The East-West pipeline connects Saudi production areas to the Red Sea coast, so simultaneous insecurity around the pipeline and Bab el-Mandeb reduces the practical resilience of routes intended to bypass Hormuz.
What changed
The assessment now centres on the contested Houthi seizure of Mokha and Mayun, rather than a broad threat picture; September 13 attack claims show the conflict remains active.
The assessment
Current judgement
Houthi territorial gains have made Bab el-Mandeb security a more immediate operational risk while Saudi alternative export infrastructure has also come under attack.
Key assumption
The judgement depends on Houthi positions at Mokha and Mayun remaining operationally usable despite Yemeni government regrouping.
Impacts
Military & Security
Contested Houthi control of Mokha and Mayun extends the conflict into the Bab el-Mandeb area, while further attacks claimed on September 13 indicate continued cross-border strike risk.
Trade & Supply Chains
The Houthi advance raises operational risk around Bab el-Mandeb, a Red Sea-Gulf of Aden passage, but the evidence does not establish a general closure to commercial navigation.
Energy
The September 10 precautionary shutdown of Saudi Arabia’s East-West pipeline highlights vulnerability in an export route designed to reduce dependence on the Strait of Hormuz.
Full edition assessment · Military & Security
Global maritime security risk is rising in the Middle East as a reported projectile incident and vessel evacuation in the Strait of Hormuz coincides with contested Houthi gains near Bab el-Mandeb. These developments create two active pressure points around the principal Gulf and Red Sea transit routes, though neither story establishes a general closure or a verified, sustained interruption to commercial navigation.
The immediate exposure is concentrated on merchant vessels, maritime insurers and regional security forces operating near the two chokepoints. Attribution for the Hormuz incident remains unresolved, and Houthi control of newly seized positions is contested, so the operational picture is elevated and unstable rather than demonstrably broad-based or irreversible.
Low confidence · Worsening · Rising
Higher incident risk at maritime chokepoints
The reported strike and fire in Hormuz, together with Houthi territorial pressure near Bab el-Mandeb, increase the probability that ship operators face more frequent security alerts, route reassessments and protective operating measures.
Tankers, bulk carriers and container vessels transiting Gulf and Red Sea approaches face the most immediate exposure to delay, diversion and higher security-related operating costs.
Signal to watchA verified new attack, formal transit restriction, or sustained change in commercial vessel movements through either chokepoint would indicate that risk is translating into wider operational disruption.
Regional force-protection demands intensify
Iranian, Gulf and Yemeni actors must allocate more surveillance, patrol and response capacity to protect maritime approaches while the security situation remains active and attribution is incomplete.
The most exposed actors are coastal security forces and commercial operators dependent on timely incident reporting in congested waters.
Signal to watchOfficial announcements of escorts, exclusion zones, expanded patrols or new maritime coordination procedures would show a shift from monitoring to more structured force protection.
- UKMTO advisory involving a merchant vessel in the Strait of Hormuz
UK Maritime Trade Operations homepage
Full edition assessment · Energy
Energy-transport risk is rising because a reported security incident in Hormuz is occurring alongside pressure on Saudi Arabia's Red Sea alternatives. The September 10 precautionary shutdown of the East-West pipeline and contested Houthi positions near Bab el-Mandeb reduce confidence in route redundancy at the same time that Hormuz traffic is already constrained.
The evidence does not quantify lost crude or LNG volumes, demonstrate that the pipeline remains offline, or show a general maritime closure. The clearest exposure is therefore to tanker availability, freight and insurance costs, and the practical flexibility of Gulf exporters, rather than to a verified broad supply outage.
Low confidence · Worsening · Rising
Reduced confidence in export-route redundancy
Hormuz insecurity increases the value of Saudi routes to the Red Sea, but the pipeline attack and Houthi pressure near Bab el-Mandeb weaken the practical resilience of that alternative pathway.
Saudi export logistics and crude shippers are most exposed because contingency routing is less dependable when both the bypass infrastructure and its maritime outlet face security risks.
Signal to watchConfirmation that the East-West pipeline has resumed normal operation, or evidence of prolonged outage and altered export loading patterns, would clarify the scale of route-resilience loss.
Freight and insurance risk premium pressure
A more difficult transit environment around two chokepoints can raise voyage risk assessments even before physical supply losses are confirmed, increasing costs for shipowners, charterers and cargo interests.
Tanker operators, marine insurers and refiners dependent on seaborne Gulf crude face more immediate cost and scheduling exposure than upstream producers whose output has not been shown to be curtailed.
Signal to watchPublished changes in war-risk premia, tanker charter rates, insurer terms or confirmed vessel diversions would indicate that the security shock is being priced into energy logistics.
- UKMTO advisory involving a merchant vessel in the Strait of Hormuz
UK Maritime Trade Operations homepage
Full edition assessment · Trade & Supply Chains
Trade-route risk is rising as shipping faces simultaneous uncertainty in Hormuz and the Bab el-Mandeb area. The reported Hormuz vessel incident adds to an environment of already low commercial traffic, while Houthi gains near the Red Sea chokepoint increase operational risk without proving a closure or a broad suspension of voyages.
The pressure is concentrated on seaborne trade linked to the Gulf, Red Sea and Suez-connected routes. Wider supply-chain disruption remains a risk rather than an established outcome because the stories do not provide verified diversion volumes, port backlogs or cargo shortfalls.
Low confidence · Worsening · Rising
Routing uncertainty spreads across Gulf and Red Sea services
The two maritime developments increase the likelihood that carriers and charterers reassess passage timing, security procedures and available alternative routes, particularly for cargoes moving between the Gulf, Europe and Asia.
Time-sensitive cargoes and fuel-intensive logistics are most exposed to longer voyages and scheduling instability if verified incidents prompt diversions or more conservative transit decisions.
Signal to watchCarrier notices, port advisories or official maritime alerts showing a sustained reduction or rerouting of commercial transits would demonstrate a material effect on trade flows.
Iran-linked transaction execution becomes more difficult
The US shift to a presumption of denial for Iran-related specific licences, combined with new designations, raises screening and approval friction for firms and intermediaries with identified Iran-linked counterparties.
Banks, traders, insurers and logistics providers handling Iran-nexus business in Iraq, Lebanon and the United Arab Emirates face the clearest immediate compliance exposure.
Signal to watchPublic revisions to bank, insurer or logistics-provider acceptance policies for Iran-linked business would show whether the legal change is creating wider execution constraints.
- UKMTO advisory involving a merchant vessel in the Strait of Hormuz
UK Maritime Trade Operations homepage
What to watch
- Do Yemen government forces retake or establish sustained control over Mokha or Mayun?
- Do verified incidents disrupt commercial transits through Bab el-Mandeb or prompt formal routing restrictions by shipping operators or authorities?
Evidence and uncertainty
Moderate confidence. Moderate confidence. 6 retained references from 2 reporting origins (Associated Press, Reuters). Claim-level independent corroboration has not been established. Confidence concerns the evidence for the reported development, not the probability of an outlook.
Useful context
Mayun Island
An island, also known as Perim, in the Bab el-Mandeb Strait area between the Red Sea and Gulf of Aden.
Its capture places Houthi forces closer to a critical maritime passage.
Bab el-Mandeb
The narrow strait connecting the Red Sea with the Gulf of Aden.
It is the maritime corridor exposed by the Houthi advance.
East-West pipeline
A Saudi oil pipeline linking production areas to Red Sea export facilities.
It provides an export alternative when Strait of Hormuz transit is disrupted.
Maysan
A province in southeastern Iraq.
Iraqi authorities said drones used in the Saudi pipeline attack were launched from the province.
Geographic context
- 01Mayun Island, Yemen (exact)
- 02Mokha, Yemen (city)
- 03Maysan, Iraq (region)